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Cisco Bug: CSCtd69256 - ATM SPA errors after VPI reuse in scaled onfiguration

Last Modified

Mar 10, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.8.3.BASE

Description (partial)

Symptom:
    
    spa related errors
  Generally accompanied by channel stats error.
    
    Conditions:
    
1. Configure a scaled setup with 4k ATM xconnect sessions under a L2 VP mode.
2. Delete the L2 VPs thus bringing the xconnects down.
3. Configure VC mode L2 transport and bring the xconnect sessions backup.

Under such a sequence of actions, there is a possibility that one of the VP
teardown does not go through clean leaving behind stale Channel of the VP. If a
subsequent VC is created with same VPI value, it might sometimes result in
traffic outage on that particular L2-VC.
  
  When the problem occurs, the show hw-module subslot <> counter sar will
  indicate a CID for VCD mapped to the L2 VP which was deleted indicating it is
  stale.
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